oil transfer alarm.
the engine oil tank is low, there is enough oil in the remote tank that automatic oil transfer should have occured.
check the filter at the bottom of the remote tank outlet for restrictions.
its possible to have a slow transfer due to a restriction that will allow the tank to refill at low speeds but the engine will consume it faster than the transfer can occur at high speeds thus triggering an occasional high speed alarm that will quit shortly after its brought back to idle.
normally if it actually overheated it will take 10-15 min to cool that chunk of aluminum lower than about 155 degrees to shut off the overheat audible.
The engine oil tank got too low, the remote oil tank had oil in it and the transfer did not happen fast enough.
here's a similar post with testing procedures.
http://forums.iboats.com/showthread.php?t=288110
Thumbs up on the Intrepid!